value.clear();

        List<String> keys = Arrays.asList("test_2", "test_0", "lang", "test_1");
        value.put(keys.get(0), true);
        value.put(keys.get(1), 1000);
        value.put(keys.get(2), "ja");
        value.put(keys.get(3), "str");
        docMap = new DocMap(value);
        assertFalse(docMap.isEmpty());

        Set<Map.Entry<String, Object>> actual = docMap.entrySet();